Read about the remarkably limited language of the Piraha Tribe of the Amazon in this article - they literally have no concept of number.
Further, "No one paints and there is no art."
"Whatever isn't important in the present is soon forgotten...Very few can remember the names of all four grandparents."
No wonder there's only about 350 of them - could their in-the-moment-only life support more? Very, very doubtful.